Photos: Retinal implants
Summary: People who've lost their vision to retinal disease may soon benefit from research into ways to stimulate optic nerves.
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Optobionics chip
The Optobionics Artificial Silicon Retina chip, here seen on a penny, is just a few millimeters in diameter and thinner than a human hair. The chip's surface is covered with microscopic solar cells that gather energy from light entering the eye.
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